update-uuid.sh

#!/bin/sh

CMD_NAME=`basename $0`
OLD_MHC_TOP_DIR="${1%/}" # remove trailing slash
NEW_MHC_TOP_DIR="${2%/}" # remove trailing slash
LOG_FILE="$NEW_MHC_TOP_DIR/$CMD_NAME$$.log"

usage() {
  echo "Usage: $CMD_NAME <top-dir> <new-top-dir>"
  echo "  $CMD_NAME copies old mhc files from <top-dir> into"
  echo "  <new-top-dir> migrating to the new format."
  echo "  New format is:"
  echo "   + X-SC-Record-Id is now in UUID style."
  echo "   + Each filename is in the form of {UUID}.mhc, not [0-9]+."
  echo "   + UUID in X-SC-Record-Id is same as its file's base name."
  echo "   + All articles are flatly placed in TOP/spool/ directory."
} >&2

################################################################
## sanity checks

if [ $# -ne 2 ]; then
  usage
  exit 1
fi

if [ ! -d "$OLD_MHC_TOP_DIR" ]; then
  echo "Error: $OLD_MHC_TOP_DIR does not exist." >&2
  usage
  exit 1
fi

printf "Converting... logfile will be in $LOG_FILE\n" >&2

for file in $(find "$OLD_MHC_TOP_DIR" -type f -name '*[0-9]' | grep -v trash)
do
  UUID=`uuidgen`
  newdir="$NEW_MHC_TOP_DIR/spool"
  newpath="$newdir/$UUID.mhc"
  printf "$file -> $newpath\n"

  if [ ! -d "$newdir" ]; then
    mkdir -p "$newdir"
  fi

  LANG=C sed "s/^X-SC-Record-Id:.*/X-SC-Record-Id: $UUID/" "$file" > "$newpath"
done > "$LOG_FILE" 2>&1

exit 0
# Copyright (C) 2015  MHC developing team. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. Neither the name of the team nor the names of its contributors
#    may be used to endorse or promote products derived from this software
#    without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE TEAM AND CONTRIBUTORS ``AS IS''
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
# THE TEAM OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
# INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
# OF THE POSSIBILITY OF SUCH DAMAGE.

@tats san, I've added the mention about the license.
Sorry for missing your comment.